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Yard and Square Yard – A Short Note
A yard is a unit of length used in the imperial and U.S. customary systems. One yard equals 3 feet or 36 inches, which is approximately 0.9144 meters. Yards are commonly used to measure longer lengths or distances, such as in sports fields, fabric measurements, or landscaping.
A square yard (written as yd²) is a unit of area. It represents the area of a square that is one yard (3 feet) on each side. One square yard equals 9 square feet or 1,296 square inches, and approximately 0.836 square meters. Square yards are often used to measure surfaces like carpeting, lawns, or large fabric areas.
In short, a yard measures how long something is, while a square yard measures how much surface area it covers. Understanding both is useful in construction, gardening, and textile industries.
Femtometer and Square Femtometer – A Short Note
A femtometer (symbol: fm) is a unit of length in the metric system, equal to:
1 femtometer = 10⁻¹⁵ meters
It is also known as a fermi (symbol: f), named after physicist Enrico Fermi. The femtometer is commonly used in nuclear physics to measure the size of atomic nuclei and subatomic particles. For example, a typical atomic nucleus is about 1–10 femtometers in diameter.
A square femtometer (symbol: fm²) is a unit of area that represents a square with sides one femtometer in length:
1 fm² = (10⁻¹⁵ m) × (10⁻¹⁵ m) = 10⁻³⁰ m²
This unit is used to describe extremely small surface areas at the nuclear or particle scale, though less commonly than the length unit.
In summary:
Femtometer (fm) measures very small lengths (nuclear scale)
Square femtometer (fm²) measures extremely tiny areas
Used mainly in nuclear and particle physics.